9. If the wages of 4 men for 30 days amount to 3900, find the wages of 20 men for 40 days.
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4 men for 30 days :—3900
1 men for 1 day :—3900/(30*4) =Rs. 32.5
Now , 1 men worked for 40 days wage :—
32.5*40 = 1300
So, for 20 men the total wage would be……
20*1300 = 26000
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